| A | B |
|---|
| revolution | the motion of a body spinning around another body |
| rotation | spinning around on an axis |
| axis | an imaginary line around which something spins |
| umbra | the darkest part of the shadow |
| penumbra | the lighter shadow around an umbra |
| neap tides | tides that are not as high or low as usual |
| spring tides | extra high tides and extra low tides |
| gravity | a force that pulls all objects toward the earth |
| crescent | a phase of the moon in which we see less than half the moons face. |
| gibbous | a phase of the moon in which we see more than half the moon's face. |
